ANSI ASA Flanges – High Vacuum Nonrotatable Flange Solutions

MDC’s ANSI ASA Flanges are high-precision, nonrotatable vacuum flanges that mate with standard 150 lb. ASA-ANSI connections. Available with either a smooth face or O-ring groove, these flanges ensure reliable vacuum sealing through the compression of an FKM (Viton®) elastomer O-ring between a mated pair. They are offered either blank or bored to accommodate tube sizes from 1.5" to 12" O.D. (38.1 mm to 304.8 mm). Each flange is crafted from Type 304 stainless steel with a 32 micro-inch (0.81 µm) surface finish and 45° chamfered corners for ease of installation and leak-tight performance. MDC ASA flanges support vacuum levels to 1x10⁻⁸ Torr (1.33x10⁻⁶ Pa) and bakeout up to 200°C (392°F), with 150°C (302°F) recommended for continuous use.

Industry Applications

MDC’s ANSI ASA Flanges are widely used in vacuum chambers, manifolds, furnaces, valves, pumps, diffusion pump stations, test systems, and experimental setups that require robust and standard-compliant flange connections. Their nonrotatable construction, ANSI compatibility, and high vacuum performance make them suitable for industries such as semiconductor processing, aerospace, pharmaceuticals, and materials research. Whether building a new vacuum system or retrofitting existing equipment, these flanges provide long-lasting durability, reliable O-ring sealing, and thermal resistance, supporting precision control in critical vacuum environments.